A deep trough of low pressure moving over Southern California was creating the strong winds, the National Weather Service said. They’re expected to blow west to southwest between 20 and 30 mph, though gusts could reach speeds up to 40 or 50 mph.

The strongest winds were expected in the afternoon and evening along mountain crests, through mountain passes and into adjacent deserts, the NWS said. The winds were expected to die down by early Friday, but strong winds could pick up again Friday afternoon.

The wind advisory, signaling winds or gusts of at least 35 miles per hour, will be in force from 11 a.m. Thursday until 1 a.m. Friday

The weather agency advised those in the mountains and deserts to “drive with extra caution.”

“Strong winds can make driving difficult, especially for high profile vehicles,” the NWS said. “Blowing dust in the deserts can lead to restrictions in visibility.”

The same low-pressure trough creating the strong winds far inland will also stir up the outer coastal waters Thursday, creating hazardous conditions for small boats. The NWS said a small craft advisory was to go into effect for the outer coastal waters Thursday afternoon through late Thursday evening.

—City News Service

Hold On! Wind Advisory for San Diego Mountains and Desert Areas was last modified: September 21st, 2017 by Debbie L. Sklar

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